I've been unable to login to the MixRadio service as a + subscriber for about a month, after upgrading to W10 on PC, resetting my W8.1 tablet and restoring to 8.1 or using W10 on the phone. Oddly, clicking Play me does play a mix of music that was in my favorites, before they were all wiped after reinstalling the app. I accidentally uninstalled it on my Surface RT when testing why my login still worked there and not other devices, but it's now the one device I can't install back onto, through the store or forcing install from the web showing owned apps :(. The last artist played still appears as lock screen though...COBHC.